äitinse
äitinse is a Finnish word that translates to "his mother" or "her mother" in English. It is a possessive suffix attached to the word "äiti," which means mother. The suffix "-nsä" indicates a third-person possessor, meaning the mother belongs to someone else, but that someone is not explicitly stated in the word itself. The context of the sentence would clarify who "his" or "her" refers to.
For example, in the sentence "Hän näki äitinsä," "Hän" means "he" or "she," and "äitinsä" signifies "his
The word "äitinse" is a standalone form used when the possessor is clearly understood from prior context.